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. a. N; PIERCE. CABBURETORP APPLICATION FILED MAR 2, 1917.

1,403,706. Patented J in/17,1922.

2 SHEETS-SHEET 1.

,B. N. PIERCE;

CARBUBETORQ APPLICATION men MAR. 2. 1917 Patented Jan. 17,1922.-

" 2 SHEETS-:SHEj-IT 2.

" a m re r m MW a it l l a l l l? it. t til l" BURT Ill, IE, IlOlilTUIll GALE"! ll ,llllil, lilpecillcatien .ltp ilication filed ltiarcn 53,

T 0 aZZ whom it may concern e it known tllttl, T cit zen oi. the United L l V ton in the county of acliusetts, indu lI'ul limp]?oveinents in Carburetor which the following is a specification, 1: once being bad therein to the accompany drawings.

This invention relates to certain new and useful improvements in carburetors the object being;- to provide a carburetor with a primary V enturi tube having; a nozzle an longed therein, and a conical tube hav nozzle dis iosed adjacent thereto, conical tube being; disposed to deliver into the main air passage or preliminary mix 3 chamber additional :tuel wheugthe suction controlled valve is raised on the increased speed of the motor, said valve provid' means tor delivering; into the main Ini chamber an additional suppl the main volume of i be fo lowed by an anon order to produce a thorough the mixing; chamber so charge will be produced wl is V 7 rent. lv Within the o linden olf the engine.

.l'lnother object ct my ii'ivention to pro-- vide a carburetor having a mixing chamber which coinint icates with the nrianary Venturi tube tl'irough a hollow suctimi-controlled valve Which valve norn'iallv closes e aui-ziliary air supplyso that the an. 'li U air will not he delivered to the mixing chamber until the suction created therein is increased by the SPGOtl oi? the inctoix .atnother and :turthcr object ot the invent n is to provide a carburetor with. a priming jet disposed abo e the throttle valve having needle valve control. and nrovided with a fuel conduit extending to the bowl. oi the carburetor in order to allow pure fuel to be drawn directly from the bowl to the throttle chamber of the carlnirctor which enables a cold motor to bestarted readily.

Another and further object of the invontiou to prrflivide a carburetor which is so c u1structed that when the speed oi? the motor is incr sod beyond a predetermined. speed thehigli speed jet will be brou it into operation so to deliver to the preliminary mixing chamber additional tuel am the same time an additional air supply pro vided so asto produce the proper mixture of air and gas at all speeds of the engine.

l li innon, a residing at Boaoil; and State {Pa n li atented Jan. 1'7, rose.

191?. Flcriol No. 159,028.

.i mtlier object of inv invention is to bro- Pie and cheap inconstruction, the bcq formed or two castings bolted t tether of the invention will be hereinafter set tort.

and the novel lectures ended claims.

in. the drawings,

'7; 1' .1 liigu e 1 is a longltuoinal vertical section through the carburetor;

rigurc 2 IS a perspective view of the carburetor o is a "ML lcal transverse section thereof defined by LD' through. the floo arr-d fuel chamber showing i I l the seconoary air inlet tube and the control tor the pruning jet gore is af crspcctivc w of the V --11S 1101 ad usting and holding the sum troncont-rolled valve n position in respect north. ike numerals-ct reference refer to like in the several figures of the dra ring. carrying out my invention 1 cons;

a carluu'etor cl superposed castings compris no; a base section 1 and a top section 2 pro titled with laterally extending; abutting annular f anges secured together bvbolts 3. the base section 1 is provided Wlljll a vcrtilly disposed car ire-ting passage at having a lateral air inlet at its lower end, said carbureif ssagt terminating in a conical portion G at its upper end forming: a con cal valve seat '7 for the purpose hereinor tally described. 'lhe upper or conical portion of the earbureting passage at lorn'is a preliminary mi cg chamber 6 in which a preliminary mixture of the air and gas is obtained. so that when the mixture reaches the main mixing chamber the mixture will be completed to n .uce a high explosive charge Will be hereinafter fully described.

' ence of the base portion.

groove 11 is adapted to reg1ster with a fuel.

v needle valve off of itsscat so as to flood 1 as clearly shown.

annular groove 11 formed on the cireumieia The annular passage 13 formed by a bore extending from a float and tuel chamber 14 which is preferably formed integral with the base section chamber is provided with a fuel supply 15 controlled by a needle valve 16 carried by the arm of a float 18 which is pivotally mounted within the chamber in the usual manner. A removable cover 19 is provided for closing the float and fuel chamber which is secured thereon. in any desired manner and is provided with a spring plunger 20 adapted to engage the float for forci 1g the same downwardly in order to raise the the carburetor if desired.

The wall of the conical portion (3 is cut away as shown at 21 into which extends a high speed nozzle 22 formed on the upper end of a' fuel pipe 23 extending from the float and fuel chamber, saidnozzle bein disposed adjacent the contracted portion or a conical tube 2a through which air is adapted to pa'ssin order to draw fuel out or" the high speed nozzle so that the additional fuel will be discharged into the preliminary mixing chamber as will be hereinafter fully described.

The upper section 2 of the carburetor i provided with a mixing chamber 25 having a horizontally disposed arm 26 terminating in a socket 28 in which is secured a valve stem 29 on which is slidably mounted the bearing sleeve portion 30 of a spider 31 of a hollow conical floating suction-controlled valve 32, the lower portion of which i adapted to cooperate with the seat 7 formed by the upper portion of the lower section 1. The upper portion of the valve 32 is provided with a cylindrical portion 32 adapted portion 82 has a diameter a few thousandths.

of an inch less than the diameter of the seat 33 tormed'in the bottom of the mixing chamber. The auxiliary air chamber 86 has its wall cut away. above the secondary Venturi tube to produce an auxiliary air inlet 37 through which air passes when the valve is raisedin a cylindrical column so as to follow the combustion charge entering the mixingchamber whereby a proper mixture will be obtained at all speeds of the engine.

The valve stem 29 is surrounded by a coil spring 38 above the bearing sleeve of the valve in order to produce a cushioning bufl'er so as to check the quick action. oi the The float and fuel valve. As the valve raises the spring is carried .with the same until the spring is brought into engagement with the sleeve which prevents the valve from hammering when the same is raised quickly by the increased suction of the engine.

A leather washer 39 is placed on the valve stem 29 below the valve 31.. and is held in position by ametal washer 39 slidably mounted on the stem above a pin 40 so as to provide a cushion support for the valve on the stem.

In order to provide means for adjusting the position of the suction-controlled valve in respect to its seat, I arrange within a transverse bore 1-1 a shaft -12 which is pro vided with a cam at its inner end adapted to engage the washer 39' for raising the valve oil of its seat, said shail't being provided with a milled head engaged by a spring plunger 45 for locking the same in adjusted position and in use the cam is so adjusted that the valve 32 is held slightly raised.

It will be seen from the construction thus far described that I have provided a carburetor with a carbureting passage having a main air supply which coininunicatcs with a mixing chamber through a hollow suctioncontrolled valve and with an auxiliary air supply which is normally held closed by a suction-controlled valve s0 that the S'3C()ll(lary or high speed jet will not be brought into operation until the speed ol' the motor increases beyond the normal speed of travel at which time the high speed jet is uncovered so as to allow the additional fuel to be drawn down 'ardly around the outside wall of the suction-controllcd valve into the preliminary mixing chamber where it mingles with the mixture and is conveyed to the mixing chamber.

By mounting the suction-controlled valve on a fixed valve stem having the cushioning spring arranged above the stem .l provide means for preventing the valve i'rom hammering and by having the same supported on a washer which cushions the closing of the valve I provide a suctionwrmtrolled valve which is noiseless in operation.

The upper section 2 is provided with a throttle chamber 46 surrounded by a heating chamber 47 having an inlet 48 and an outlet 49, the inlet being provided with a butterfly valve 50 carried by a alve stem 51 on which is secured the hub portion 52 of an arm 53. A throttle valve 54; is mounted in the throttle chamber 46 upon :1 valve stem 55 which extends out through the walls of the section and is provided with an arm 57 connected to the arm 53 by a link 58 so as to open and close the intake to the heating chamber as the throttle is opened and closed. The section 2 is provided with a lug 59 carrying an adjusting screw (,0

transverse only partially close the tlu-oltie naoapoe which is adapted to he engaged 57 for limiting the movement of valve 5 so that the same can be by the arm the thro le set so to chain The heating chamber d7 oi? section 2 has a solid portion. entendinp; obliquely theretlirough which is provided with a bore terminating in a recess formed in the throttle chamber above the throttle valve forming a priming nozzle 61. The lower end of the bore is closed by aplug 62 which terms. awell to which is connected a fuel supply pipe 64: which extends down into the fuel. chamber 14: shown in Figs. 2 and 3 for supplying fuel to the priming nozzle. The bore is provided with a conical seat 65 in which is adapted to be seated. the conical point66 of a needle valve 67 which. is provided with a head 68 having an annular groove to receive the bifurcated end 69 of arm 70 fixed on a rock shaft 71 pivotally mounted in a bearing formed in a hip; 72 extending outwardly from the section 2 above the auxiliary air inlet. The rock 7 shaft 71 carries an operating arm 73 which may be connected to any suitable controlling means. Surrounding; the roclr shaft is coil spring 74. which has one of its ends in engageinent with the casting, and the other ends connected to the arm 73 so to normally hold the needle valve seated. This construction provides spring actuated means for normally holding the priming nozele closer and for closing; thesaine alter the same has been manipulated from the dash to start the motor.

When the throttle is in closed position, and it is desired to start the engine by operating the dash control, the needle valve can be adjisted in respect to itsseat to allow fuel to be drawn by thefsuction oi the engine into the throttle chamber above the throttle valve so to prime the motor by allowing pure gasoline to be drawn directlj into the cylinders thereof. by the provision oi a needle valve for controlling the priming jet l pro v is a needle valve control which enables me to allow any desired amount of fuel to be drawn directly into the motor for start inp; the same.

The main working nozzle 9 is provided. with the usual needle valve 7 5 for controlling,' the :flow oi fuel therethrough, and the high speed nozzle is preferably formed with a c-"liln'ated jet so that the desired amount of 1" .el will be drawn through the same by the air passing through the secondary Venturi tube the suction controlled valve is raised so that the proper proportion of fuel and air will be. delivered to the mixing chamber when the motor is running at different rates ct speed and by this construction I am able to increase the speed of the motor to which a carburetor is attached quickly without chokingthe same.

the upper will The interior oi the floating suction-controlled valve 89. has a shape of a Venturi tube through which passes the partially mired char es l'rrnn the low and hipgh speed nozzles so to increase the velocitfv of the passage ol? the charge entering the main mining chamber.

'llhe operation as herein shown and described is as follows: l l hen the motor to the carburetor is bed is running at lo speed is talreni hro 1 the inlet 5 and passes around and overthe main or low speed nozzle 9 and draws fuel theret'roni; at the same time a small additional amount of air enters. around the limiting Venturi tube ZtOllTlGil by the tloatl suction controlled valve from the auxiliary air chainl and the air and mixture is drawn to the hp; chamber "lllOl gh the floating; Venturi tu e and is delivered to the engine in the 1.. .al manner. The suction-controlled valve is adjusted so that the same held slightly above the to provide annular air inlet so asto allor." small volume of air to pass down around the outer face thereof into the lower portion oi the floating venturi termed by the valve. the speed oi the motor is other increased the valve is raised by the .....creased suction. so as to gradually uncover the high speed nozzle audair rushes through tlw conical tube and drawsluel out oi? the l o nor ale wl is drawn r ownu'ai ll :mtotheinaina andnirugles with air and ein and passes up through. in tube and delivered into the re chamber.

.lllhe length of the cylindrical portion oi: the :tloctit suctioncontrolled valve och an pron U the auxiliary air not to the resin in chambe until. increased to c valve raised apand down as the 1.99mi ol' the en ed or d creased u houi; supplyihu" ad litional {ill but the su l of air to th- I in; chm 1-- the n'iotor has inspeed to such an extent that the the mi in; chau'iber is sutficicnt to raise the su i-controlled valve to allow :ulditionsl air to enter the mining chamber the l h speed nestle is uncovered so as to rush through the secondary tidie and as the suction within. the inar v mixing chamber or nriu air pav is so the mixture oi l deliver d. in the high speed nozzl is e up its iwardl v into the preliminary l'l'lCl]. which wardly through the floating Venturi tube into the main mixing chamber. As the high speed nozzle is brought into operation by the raising of the valve, the auxiliary air supply allows a cylindrical column of air to enter the main mixing chamber quickly tomix with the preliminary mixture entering the floating Ventnri tube formed by the hollow suction-controlled valve so as to obtain a thorough mixture of air and gas, and it will be seen that by the construction herein shown and descrihed a central volume of air and fuel is drawn through the tloating l ent-uri tube into the main mixing chamber surrounded by a cylindrical column 0t air from the auxiliary air chamber.

In practice I have found that a small amount'o'l fuel will be drawn from the high speed nozzle before the valve has raised to such an extentas to open the additional air supply to the main mixing chamber. as when the valve is raised slightly a small amount of air will pass through the secondary Venturi tube-over the high speed nozzle so as to supply a slight additional amount of fuel a an intermediate speed of the motor, and fact, the construction of the parts are such that the carburetor is sensitive to a slight increase of speed; that is, an additional amount of: air andi uel is proportionally admitted as the speed of the motor is gradually increased, and when the motor has reached a high speed, the nozzles are open to the full force of the air from the i enturi tubes so as to supply the motor with ample fuel, and at the same time the auxiliary air suppliesare brought into operation so that the proper mixture is obtained on all speeds of the motor.

in the operation of the priming jet in startingthe motor fuel will. be drawn directly from the bowl into the throttle cham bcr above the throttle valve so that the suction of the engine will draw fuel or mixture into the cylinders thereof in order to allow the same to start quickly.

From the foregoing description is will be seen that l have provided a carburetor with. a priming nozzle for starting the motor to which it is attached, a working nozzle for supplyinga mixture to the motor when runing at low or high speed and with a high speed nozzle for supplying to the mixture produced by the low speed nozzle an addi tional supply of fuel and air in order to obtain the proper mixture in all speeds of the engine.

I claim:

- 1.; in a. carburetor, a main :tuel nozzle, an air passage having a main air inlet and beyond said fuel nozzle superposed secondary air inlets, the bottom secondary air inlet woe being of conical form, a high speed nozzlc arranged at the contracted end otl? said conical secondary air inlet and a suction operated tubular valve controlling said secondary uir inlet and fuel nozzle, and serving to conduct the mixture of aiand fuel from said nozzles to a point beyond the upper secondary air inlet.

52. in a carburetor, a main 'l'uel nozzle, an

air passage having a main air inlet and beyond said fuel nozzle two separated secondary air inlets, a high speed vtuel nozzle arranged in alignment with the air current from the secondary air inlet which is nearcst the main fuel nozzle and a suction controlled tuhular valve controlling; successively said secondary air inlets and StlYlIlg' to conduct the mixture of air and fuel from said nozzles, the secondary air inlet associated with the high speed nozzle being the first to open.

In a carburetor having a carbureling passage 0, ccndinp; therethrough provided with a main air inlet at its lower end and a fuel nozzle disposed therein, said .arlnu'cting passage 1 iving separated secondary air inlets arranged above the main tucl nozzle. one 0t said secondary air inlets having a conical passage, a fuel nozzle \iiSl'PUSWl in alignment with the end of said conical pas sage and a suction controlled valvc o'l tubular form controlling successively said secondary air inlets and serving to conduct the mixture of air and fuel from said nozzles, one of said secondary air inlets delivering a hollow column oi air to said carluu'ctincpassage around the fuel and air passiu;

through said tubular suction cmilrollcd valve.

4-.-ln a carburetor having a carhureting passage extending there hroun h provided with a main air inlet at its lower end and uv main luel nozzle, separated secondary air inlets arranged above said main lucl nozzle. a high speed nozzle arranged in alignment with the secondary air inlet disposed closest to toe main fuel nozzle, a tubular suction controlled valve controlling siuhcessivcl said secondary air inlets and arranged to receive and conduct the mixture of air and fuel from said nozzles. the secondary air inlet arranged the farthest away from said main fuel nozzle being" arranged to deliver a hollow column of air around the mixture or" r'uel and air passingthrough said tubular suction controlled valve.

In testimony whereof I hereunto aliix my signature in the presence of a witness.

BURT N. PIERCE.

l Vitness BEA P. WRIGHT.

lib 

